Calendar · Chicago IL · Denver CO

Kentucky Bluegrass care calendar for zone 5

Cold winter, mild-to-warm summer; the heart of the cool-season lawn belt. Kentucky bluegrass, tall fescue, fine fescue, and perennial rye all thrive. Spring green-up usually arrives by April; lawn is fully active May through mid-October.

Kentucky bluegrass is the iconic cool-season lawn: fine-bladed, deep emerald-blue under fertility, and the only common species that spreads aggressively by rhizome (so it self-repairs from divots and dog spots). The trade-off is heat sensitivity: by mid-July in zone 7 it browns and goes semi-dormant unless irrigated.